Indieauth website closes when opening another app

[u0nel]

Describe the bug
If you leave the app while the indieauth login page is open, it doesn't stay there so you need to reopen it.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Accounts'
2. Click on 'New Account Icon'
3. Choose 'Indieweb'
4. Type your website url
5. Click "Sign In"
6. Open Another App
7. Return to Indigenous
8. website didn't stay open.

Expected behavior
Website stays open and you can continue to login

Screenshots
https://i.u1l.de/ScreenRecord-2021-05-15-18-45-32.mp4

Smartphone (please complete the following information):

• Device: Fairphone 3
• Android version: 10 (LineageOS)

[swentel]

Hmm, yeah, this reminds of #210
I haven't found a good way yet to communicate when I open a dedicated new screen, will look at it if I find some time, but it's tricky stuff with all android versions - although I would know it would work for you as well since I have the the same device :)